#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
char* My_strcpy(char* des, const char* source)
{
	int i = 0;
	assert(des && source);
	for (i = 0; source[i] != '\0'; i++)
	{
		des[i] = source[i];
	}
	return des;
}
int main()
{
	char String[20] = {0};
	printf("%s", My_strcpy(String, "Hello World!"));
	return 0;
}